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A National Malaria Eradication Service (SENEPA) worker fumigates during a house-to-house operation aimed at eradicating the Aedes aegypti mosquito, which transmits dengue and chikungunya, in Ypacarai, Paraguay, on February 2, 2024. Hospitals in Asunción are receiving many patients with symptoms of dengue. The mosquito-borne disease, endemic to tropical areas, causes high fever, headaches, nausea, vomiting, muscle pain and, in the most serious cases, hemorrhages that can lead to death. (Photo by NORBERTO DUARTE / AFP) (KEYSTONE/AFP/NORBERTO DUARTE)